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1890 lines
64 KiB
1890 lines
64 KiB
/* |
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* AVI demuxer |
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* Copyright (c) 2001 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include <inttypes.h> |
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|
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#include "libavutil/avassert.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/bswap.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/dict.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mathematics.h" |
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#include "avformat.h" |
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#include "avi.h" |
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#include "dv.h" |
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#include "internal.h" |
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#include "riff.h" |
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#include "libavcodec/bytestream.h" |
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#include "libavcodec/exif.h" |
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|
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typedef struct AVIStream { |
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int64_t frame_offset; /* current frame (video) or byte (audio) counter |
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* (used to compute the pts) */ |
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int remaining; |
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int packet_size; |
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|
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uint32_t handler; |
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uint32_t scale; |
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uint32_t rate; |
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int sample_size; /* size of one sample (or packet) |
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* (in the rate/scale sense) in bytes */ |
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|
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int64_t cum_len; /* temporary storage (used during seek) */ |
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int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */ |
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int prefix_count; |
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uint32_t pal[256]; |
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int has_pal; |
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int dshow_block_align; /* block align variable used to emulate bugs in |
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* the MS dshow demuxer */ |
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|
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AVFormatContext *sub_ctx; |
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AVPacket sub_pkt; |
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uint8_t *sub_buffer; |
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|
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int64_t seek_pos; |
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} AVIStream; |
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|
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typedef struct AVIContext { |
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const AVClass *class; |
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int64_t riff_end; |
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int64_t movi_end; |
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int64_t fsize; |
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int64_t io_fsize; |
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int64_t movi_list; |
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int64_t last_pkt_pos; |
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int index_loaded; |
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int is_odml; |
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int non_interleaved; |
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int stream_index; |
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DVDemuxContext *dv_demux; |
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int odml_depth; |
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int use_odml; |
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#define MAX_ODML_DEPTH 1000 |
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int64_t dts_max; |
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} AVIContext; |
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|
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|
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static const AVOption options[] = { |
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{ "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM}, |
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{ NULL }, |
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}; |
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|
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static const AVClass demuxer_class = { |
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.class_name = "avi", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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.category = AV_CLASS_CATEGORY_DEMUXER, |
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}; |
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|
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static const char avi_headers[][8] = { |
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' }, |
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' }, |
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 }, |
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' }, |
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{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' }, |
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{ 0 } |
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}; |
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|
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static const AVMetadataConv avi_metadata_conv[] = { |
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{ "strn", "title" }, |
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{ 0 }, |
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}; |
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|
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static int avi_load_index(AVFormatContext *s); |
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static int guess_ni_flag(AVFormatContext *s); |
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|
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#define print_tag(str, tag, size) \ |
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av_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \ |
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avio_tell(pb), str, tag & 0xff, \ |
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(tag >> 8) & 0xff, \ |
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(tag >> 16) & 0xff, \ |
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(tag >> 24) & 0xff, \ |
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size) |
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|
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static inline int get_duration(AVIStream *ast, int len) |
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{ |
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if (ast->sample_size) |
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return len; |
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else if (ast->dshow_block_align > 1) |
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return (len + ast->dshow_block_align - 1) / ast->dshow_block_align; |
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else |
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return 1; |
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} |
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|
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static int get_riff(AVFormatContext *s, AVIOContext *pb) |
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{ |
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AVIContext *avi = s->priv_data; |
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char header[8]; |
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int i; |
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|
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/* check RIFF header */ |
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avio_read(pb, header, 4); |
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avi->riff_end = avio_rl32(pb); /* RIFF chunk size */ |
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avi->riff_end += avio_tell(pb); /* RIFF chunk end */ |
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avio_read(pb, header + 4, 4); |
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|
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for (i = 0; avi_headers[i][0]; i++) |
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if (!memcmp(header, avi_headers[i], 8)) |
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break; |
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if (!avi_headers[i][0]) |
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return AVERROR_INVALIDDATA; |
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|
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if (header[7] == 0x19) |
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av_log(s, AV_LOG_INFO, |
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"This file has been generated by a totally broken muxer.\n"); |
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|
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return 0; |
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} |
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|
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num) |
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{ |
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AVIContext *avi = s->priv_data; |
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AVIOContext *pb = s->pb; |
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int longs_pre_entry = avio_rl16(pb); |
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int index_sub_type = avio_r8(pb); |
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int index_type = avio_r8(pb); |
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int entries_in_use = avio_rl32(pb); |
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int chunk_id = avio_rl32(pb); |
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int64_t base = avio_rl64(pb); |
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int stream_id = ((chunk_id & 0xFF) - '0') * 10 + |
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((chunk_id >> 8 & 0xFF) - '0'); |
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AVStream *st; |
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AVIStream *ast; |
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int i; |
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int64_t last_pos = -1; |
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int64_t filesize = avi->fsize; |
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|
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av_dlog(s, |
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"longs_pre_entry:%d index_type:%d entries_in_use:%d " |
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"chunk_id:%X base:%16"PRIX64"\n", |
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longs_pre_entry, |
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index_type, |
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entries_in_use, |
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chunk_id, |
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base); |
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|
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if (stream_id >= s->nb_streams || stream_id < 0) |
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return AVERROR_INVALIDDATA; |
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st = s->streams[stream_id]; |
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ast = st->priv_data; |
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|
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if (index_sub_type) |
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return AVERROR_INVALIDDATA; |
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|
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avio_rl32(pb); |
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|
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if (index_type && longs_pre_entry != 2) |
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return AVERROR_INVALIDDATA; |
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if (index_type > 1) |
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return AVERROR_INVALIDDATA; |
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|
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if (filesize > 0 && base >= filesize) { |
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n"); |
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if (base >> 32 == (base & 0xFFFFFFFF) && |
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(base & 0xFFFFFFFF) < filesize && |
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filesize <= 0xFFFFFFFF) |
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base &= 0xFFFFFFFF; |
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else |
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return AVERROR_INVALIDDATA; |
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} |
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|
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for (i = 0; i < entries_in_use; i++) { |
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if (index_type) { |
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int64_t pos = avio_rl32(pb) + base - 8; |
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int len = avio_rl32(pb); |
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int key = len >= 0; |
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len &= 0x7FFFFFFF; |
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|
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#ifdef DEBUG_SEEK |
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av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len); |
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#endif |
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if (avio_feof(pb)) |
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return AVERROR_INVALIDDATA; |
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|
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if (last_pos == pos || pos == base - 8) |
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avi->non_interleaved = 1; |
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if (last_pos != pos && len) |
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av_add_index_entry(st, pos, ast->cum_len, len, 0, |
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key ? AVINDEX_KEYFRAME : 0); |
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|
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ast->cum_len += get_duration(ast, len); |
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last_pos = pos; |
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} else { |
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int64_t offset, pos; |
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int duration; |
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offset = avio_rl64(pb); |
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avio_rl32(pb); /* size */ |
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duration = avio_rl32(pb); |
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|
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if (avio_feof(pb)) |
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return AVERROR_INVALIDDATA; |
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|
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pos = avio_tell(pb); |
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|
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if (avi->odml_depth > MAX_ODML_DEPTH) { |
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av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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|
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if (avio_seek(pb, offset + 8, SEEK_SET) < 0) |
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return -1; |
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avi->odml_depth++; |
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read_braindead_odml_indx(s, frame_num); |
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avi->odml_depth--; |
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frame_num += duration; |
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|
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if (avio_seek(pb, pos, SEEK_SET) < 0) { |
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av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n"); |
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return -1; |
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} |
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|
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} |
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} |
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avi->index_loaded = 2; |
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return 0; |
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} |
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|
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static void clean_index(AVFormatContext *s) |
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{ |
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int i; |
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int64_t j; |
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|
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for (i = 0; i < s->nb_streams; i++) { |
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AVStream *st = s->streams[i]; |
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AVIStream *ast = st->priv_data; |
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int n = st->nb_index_entries; |
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int max = ast->sample_size; |
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int64_t pos, size, ts; |
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|
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if (n != 1 || ast->sample_size == 0) |
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continue; |
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|
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while (max < 1024) |
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max += max; |
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pos = st->index_entries[0].pos; |
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size = st->index_entries[0].size; |
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ts = st->index_entries[0].timestamp; |
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for (j = 0; j < size; j += max) |
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av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0, |
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AVINDEX_KEYFRAME); |
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} |
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} |
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static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, |
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uint32_t size) |
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{ |
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AVIOContext *pb = s->pb; |
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char key[5] = { 0 }; |
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char *value; |
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|
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size += (size & 1); |
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|
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if (size == UINT_MAX) |
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return AVERROR(EINVAL); |
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value = av_malloc(size + 1); |
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if (!value) |
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return AVERROR(ENOMEM); |
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avio_read(pb, value, size); |
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value[size] = 0; |
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|
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AV_WL32(key, tag); |
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return av_dict_set(st ? &st->metadata : &s->metadata, key, value, |
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AV_DICT_DONT_STRDUP_VAL); |
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} |
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|
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static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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|
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static void avi_metadata_creation_time(AVDictionary **metadata, char *date) |
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{ |
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char month[4], time[9], buffer[64]; |
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int i, day, year; |
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/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */ |
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if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d", |
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month, &day, time, &year) == 4) { |
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for (i = 0; i < 12; i++) |
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if (!av_strcasecmp(month, months[i])) { |
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snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s", |
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year, i + 1, day, time); |
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av_dict_set(metadata, "creation_time", buffer, 0); |
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} |
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} else if (date[4] == '/' && date[7] == '/') { |
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date[4] = date[7] = '-'; |
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av_dict_set(metadata, "creation_time", date, 0); |
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} |
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} |
|
|
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static void avi_read_nikon(AVFormatContext *s, uint64_t end) |
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{ |
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while (avio_tell(s->pb) < end) { |
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uint32_t tag = avio_rl32(s->pb); |
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uint32_t size = avio_rl32(s->pb); |
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switch (tag) { |
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case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */ |
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{ |
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uint64_t tag_end = avio_tell(s->pb) + size; |
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while (avio_tell(s->pb) < tag_end) { |
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uint16_t tag = avio_rl16(s->pb); |
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uint16_t size = avio_rl16(s->pb); |
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const char *name = NULL; |
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char buffer[64] = { 0 }; |
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size = FFMIN(size, tag_end - avio_tell(s->pb)); |
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size -= avio_read(s->pb, buffer, |
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FFMIN(size, sizeof(buffer) - 1)); |
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switch (tag) { |
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case 0x03: |
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name = "maker"; |
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break; |
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case 0x04: |
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name = "model"; |
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break; |
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case 0x13: |
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name = "creation_time"; |
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if (buffer[4] == ':' && buffer[7] == ':') |
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buffer[4] = buffer[7] = '-'; |
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break; |
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} |
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if (name) |
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av_dict_set(&s->metadata, name, buffer, 0); |
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avio_skip(s->pb, size); |
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} |
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break; |
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} |
|
default: |
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avio_skip(s->pb, size); |
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break; |
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} |
|
} |
|
} |
|
|
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static int avi_extract_stream_metadata(AVStream *st) |
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{ |
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GetByteContext gb; |
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uint8_t *data = st->codec->extradata; |
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int data_size = st->codec->extradata_size; |
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int tag, offset; |
|
|
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if (!data || data_size < 8) { |
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return AVERROR_INVALIDDATA; |
|
} |
|
|
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bytestream2_init(&gb, data, data_size); |
|
|
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tag = bytestream2_get_le32(&gb); |
|
|
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switch (tag) { |
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case MKTAG('A', 'V', 'I', 'F'): |
|
// skip 4 byte padding |
|
bytestream2_skip(&gb, 4); |
|
offset = bytestream2_tell(&gb); |
|
bytestream2_init(&gb, data + offset, data_size - offset); |
|
|
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// decode EXIF tags from IFD, AVI is always little-endian |
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return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata); |
|
break; |
|
case MKTAG('C', 'A', 'S', 'I'): |
|
avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag); |
|
break; |
|
case MKTAG('Z', 'o', 'r', 'a'): |
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avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int calculate_bitrate(AVFormatContext *s) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
int i, j; |
|
int64_t lensum = 0; |
|
int64_t maxpos = 0; |
|
|
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for (i = 0; i<s->nb_streams; i++) { |
|
int64_t len = 0; |
|
AVStream *st = s->streams[i]; |
|
|
|
if (!st->nb_index_entries) |
|
continue; |
|
|
|
for (j = 0; j < st->nb_index_entries; j++) |
|
len += st->index_entries[j].size; |
|
maxpos = FFMAX(maxpos, st->index_entries[j-1].pos); |
|
lensum += len; |
|
} |
|
if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file |
|
return 0; |
|
if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch |
|
return 0; |
|
|
|
for (i = 0; i<s->nb_streams; i++) { |
|
int64_t len = 0; |
|
AVStream *st = s->streams[i]; |
|
int64_t duration; |
|
|
|
for (j = 0; j < st->nb_index_entries; j++) |
|
len += st->index_entries[j].size; |
|
|
|
if (st->nb_index_entries < 2 || st->codec->bit_rate > 0) |
|
continue; |
|
duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp; |
|
st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num); |
|
} |
|
return 1; |
|
} |
|
|
|
static int avi_read_header(AVFormatContext *s) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
unsigned int tag, tag1, handler; |
|
int codec_type, stream_index, frame_period; |
|
unsigned int size; |
|
int i; |
|
AVStream *st; |
|
AVIStream *ast = NULL; |
|
int avih_width = 0, avih_height = 0; |
|
int amv_file_format = 0; |
|
uint64_t list_end = 0; |
|
int ret; |
|
AVDictionaryEntry *dict_entry; |
|
|
|
avi->stream_index = -1; |
|
|
|
ret = get_riff(s, pb); |
|
if (ret < 0) |
|
return ret; |
|
|
|
av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml); |
|
|
|
avi->io_fsize = avi->fsize = avio_size(pb); |
|
if (avi->fsize <= 0 || avi->fsize < avi->riff_end) |
|
avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end; |
|
|
|
/* first list tag */ |
|
stream_index = -1; |
|
codec_type = -1; |
|
frame_period = 0; |
|
for (;;) { |
|
if (avio_feof(pb)) |
|
goto fail; |
|
tag = avio_rl32(pb); |
|
size = avio_rl32(pb); |
|
|
|
print_tag("tag", tag, size); |
|
|
|
switch (tag) { |
|
case MKTAG('L', 'I', 'S', 'T'): |
|
list_end = avio_tell(pb) + size; |
|
/* Ignored, except at start of video packets. */ |
|
tag1 = avio_rl32(pb); |
|
|
|
print_tag("list", tag1, 0); |
|
|
|
if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
|
avi->movi_list = avio_tell(pb) - 4; |
|
if (size) |
|
avi->movi_end = avi->movi_list + size + (size & 1); |
|
else |
|
avi->movi_end = avi->fsize; |
|
av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end); |
|
goto end_of_header; |
|
} else if (tag1 == MKTAG('I', 'N', 'F', 'O')) |
|
ff_read_riff_info(s, size - 4); |
|
else if (tag1 == MKTAG('n', 'c', 'd', 't')) |
|
avi_read_nikon(s, list_end); |
|
|
|
break; |
|
case MKTAG('I', 'D', 'I', 'T'): |
|
{ |
|
unsigned char date[64] = { 0 }; |
|
size += (size & 1); |
|
size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1)); |
|
avio_skip(pb, size); |
|
avi_metadata_creation_time(&s->metadata, date); |
|
break; |
|
} |
|
case MKTAG('d', 'm', 'l', 'h'): |
|
avi->is_odml = 1; |
|
avio_skip(pb, size + (size & 1)); |
|
break; |
|
case MKTAG('a', 'm', 'v', 'h'): |
|
amv_file_format = 1; |
|
case MKTAG('a', 'v', 'i', 'h'): |
|
/* AVI header */ |
|
/* using frame_period is bad idea */ |
|
frame_period = avio_rl32(pb); |
|
avio_rl32(pb); /* max. bytes per second */ |
|
avio_rl32(pb); |
|
avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX; |
|
|
|
avio_skip(pb, 2 * 4); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avih_width = avio_rl32(pb); |
|
avih_height = avio_rl32(pb); |
|
|
|
avio_skip(pb, size - 10 * 4); |
|
break; |
|
case MKTAG('s', 't', 'r', 'h'): |
|
/* stream header */ |
|
|
|
tag1 = avio_rl32(pb); |
|
handler = avio_rl32(pb); /* codec tag */ |
|
|
|
if (tag1 == MKTAG('p', 'a', 'd', 's')) { |
|
avio_skip(pb, size - 8); |
|
break; |
|
} else { |
|
stream_index++; |
|
st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
goto fail; |
|
|
|
st->id = stream_index; |
|
ast = av_mallocz(sizeof(AVIStream)); |
|
if (!ast) |
|
goto fail; |
|
st->priv_data = ast; |
|
} |
|
if (amv_file_format) |
|
tag1 = stream_index ? MKTAG('a', 'u', 'd', 's') |
|
: MKTAG('v', 'i', 'd', 's'); |
|
|
|
print_tag("strh", tag1, -1); |
|
|
|
if (tag1 == MKTAG('i', 'a', 'v', 's') || |
|
tag1 == MKTAG('i', 'v', 'a', 's')) { |
|
int64_t dv_dur; |
|
|
|
/* After some consideration -- I don't think we |
|
* have to support anything but DV in type1 AVIs. */ |
|
if (s->nb_streams != 1) |
|
goto fail; |
|
|
|
if (handler != MKTAG('d', 'v', 's', 'd') && |
|
handler != MKTAG('d', 'v', 'h', 'd') && |
|
handler != MKTAG('d', 'v', 's', 'l')) |
|
goto fail; |
|
|
|
ast = s->streams[0]->priv_data; |
|
av_freep(&s->streams[0]->codec->extradata); |
|
av_freep(&s->streams[0]->codec); |
|
if (s->streams[0]->info) |
|
av_freep(&s->streams[0]->info->duration_error); |
|
av_freep(&s->streams[0]->info); |
|
av_freep(&s->streams[0]); |
|
s->nb_streams = 0; |
|
if (CONFIG_DV_DEMUXER) { |
|
avi->dv_demux = avpriv_dv_init_demux(s); |
|
if (!avi->dv_demux) |
|
goto fail; |
|
} else |
|
goto fail; |
|
s->streams[0]->priv_data = ast; |
|
avio_skip(pb, 3 * 4); |
|
ast->scale = avio_rl32(pb); |
|
ast->rate = avio_rl32(pb); |
|
avio_skip(pb, 4); /* start time */ |
|
|
|
dv_dur = avio_rl32(pb); |
|
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { |
|
dv_dur *= AV_TIME_BASE; |
|
s->duration = av_rescale(dv_dur, ast->scale, ast->rate); |
|
} |
|
/* else, leave duration alone; timing estimation in utils.c |
|
* will make a guess based on bitrate. */ |
|
|
|
stream_index = s->nb_streams - 1; |
|
avio_skip(pb, size - 9 * 4); |
|
break; |
|
} |
|
|
|
av_assert0(stream_index < s->nb_streams); |
|
ast->handler = handler; |
|
|
|
avio_rl32(pb); /* flags */ |
|
avio_rl16(pb); /* priority */ |
|
avio_rl16(pb); /* language */ |
|
avio_rl32(pb); /* initial frame */ |
|
ast->scale = avio_rl32(pb); |
|
ast->rate = avio_rl32(pb); |
|
if (!(ast->scale && ast->rate)) { |
|
av_log(s, AV_LOG_WARNING, |
|
"scale/rate is %"PRIu32"/%"PRIu32" which is invalid. " |
|
"(This file has been generated by broken software.)\n", |
|
ast->scale, |
|
ast->rate); |
|
if (frame_period) { |
|
ast->rate = 1000000; |
|
ast->scale = frame_period; |
|
} else { |
|
ast->rate = 25; |
|
ast->scale = 1; |
|
} |
|
} |
|
avpriv_set_pts_info(st, 64, ast->scale, ast->rate); |
|
|
|
ast->cum_len = avio_rl32(pb); /* start */ |
|
st->nb_frames = avio_rl32(pb); |
|
|
|
st->start_time = 0; |
|
avio_rl32(pb); /* buffer size */ |
|
avio_rl32(pb); /* quality */ |
|
if (ast->cum_len*ast->scale/ast->rate > 3600) { |
|
av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n"); |
|
ast->cum_len = 0; |
|
} |
|
ast->sample_size = avio_rl32(pb); /* sample ssize */ |
|
ast->cum_len *= FFMAX(1, ast->sample_size); |
|
av_dlog(s, "%"PRIu32" %"PRIu32" %d\n", |
|
ast->rate, ast->scale, ast->sample_size); |
|
|
|
switch (tag1) { |
|
case MKTAG('v', 'i', 'd', 's'): |
|
codec_type = AVMEDIA_TYPE_VIDEO; |
|
|
|
ast->sample_size = 0; |
|
st->avg_frame_rate = av_inv_q(st->time_base); |
|
break; |
|
case MKTAG('a', 'u', 'd', 's'): |
|
codec_type = AVMEDIA_TYPE_AUDIO; |
|
break; |
|
case MKTAG('t', 'x', 't', 's'): |
|
codec_type = AVMEDIA_TYPE_SUBTITLE; |
|
break; |
|
case MKTAG('d', 'a', 't', 's'): |
|
codec_type = AVMEDIA_TYPE_DATA; |
|
break; |
|
default: |
|
av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1); |
|
} |
|
if (ast->sample_size == 0) { |
|
st->duration = st->nb_frames; |
|
if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) { |
|
av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n"); |
|
st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end); |
|
} |
|
} |
|
ast->frame_offset = ast->cum_len; |
|
avio_skip(pb, size - 12 * 4); |
|
break; |
|
case MKTAG('s', 't', 'r', 'f'): |
|
/* stream header */ |
|
if (!size) |
|
break; |
|
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { |
|
avio_skip(pb, size); |
|
} else { |
|
uint64_t cur_pos = avio_tell(pb); |
|
unsigned esize; |
|
if (cur_pos < list_end) |
|
size = FFMIN(size, list_end - cur_pos); |
|
st = s->streams[stream_index]; |
|
if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) { |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
switch (codec_type) { |
|
case AVMEDIA_TYPE_VIDEO: |
|
if (amv_file_format) { |
|
st->codec->width = avih_width; |
|
st->codec->height = avih_height; |
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_id = AV_CODEC_ID_AMV; |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
tag1 = ff_get_bmp_header(pb, st, &esize); |
|
|
|
if (tag1 == MKTAG('D', 'X', 'S', 'B') || |
|
tag1 == MKTAG('D', 'X', 'S', 'A')) { |
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
|
st->codec->codec_tag = tag1; |
|
st->codec->codec_id = AV_CODEC_ID_XSUB; |
|
break; |
|
} |
|
|
|
if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) { |
|
if (esize == size-1 && (esize&1)) { |
|
st->codec->extradata_size = esize - 10 * 4; |
|
} else |
|
st->codec->extradata_size = size - 10 * 4; |
|
if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0) |
|
return AVERROR(ENOMEM); |
|
} |
|
|
|
// FIXME: check if the encoder really did this correctly |
|
if (st->codec->extradata_size & 1) |
|
avio_r8(pb); |
|
|
|
/* Extract palette from extradata if bpp <= 8. |
|
* This code assumes that extradata contains only palette. |
|
* This is true for all paletted codecs implemented in |
|
* FFmpeg. */ |
|
if (st->codec->extradata_size && |
|
(st->codec->bits_per_coded_sample <= 8)) { |
|
int pal_size = (1 << st->codec->bits_per_coded_sample) << 2; |
|
const uint8_t *pal_src; |
|
|
|
pal_size = FFMIN(pal_size, st->codec->extradata_size); |
|
pal_src = st->codec->extradata + |
|
st->codec->extradata_size - pal_size; |
|
/* Exclude the "BottomUp" field from the palette */ |
|
if (pal_src - st->codec->extradata >= 9 && |
|
!memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9)) |
|
pal_src -= 9; |
|
for (i = 0; i < pal_size / 4; i++) |
|
ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i); |
|
ast->has_pal = 1; |
|
} |
|
|
|
print_tag("video", tag1, 0); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_tag = tag1; |
|
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
|
tag1); |
|
/* This is needed to get the pict type which is necessary |
|
* for generating correct pts. */ |
|
st->need_parsing = AVSTREAM_PARSE_HEADERS; |
|
|
|
if (st->codec->codec_id == AV_CODEC_ID_MPEG4 && |
|
ast->handler == MKTAG('X', 'V', 'I', 'D')) |
|
st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D'); |
|
|
|
if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H')) |
|
st->need_parsing = AVSTREAM_PARSE_FULL; |
|
|
|
if (st->codec->codec_tag == 0 && st->codec->height > 0 && |
|
st->codec->extradata_size < 1U << 30) { |
|
st->codec->extradata_size += 9; |
|
if ((ret = av_reallocp(&st->codec->extradata, |
|
st->codec->extradata_size + |
|
FF_INPUT_BUFFER_PADDING_SIZE)) < 0) { |
|
st->codec->extradata_size = 0; |
|
return ret; |
|
} else |
|
memcpy(st->codec->extradata + st->codec->extradata_size - 9, |
|
"BottomUp", 9); |
|
} |
|
st->codec->height = FFABS(st->codec->height); |
|
|
|
// avio_skip(pb, size - 5 * 4); |
|
break; |
|
case AVMEDIA_TYPE_AUDIO: |
|
ret = ff_get_wav_header(pb, st->codec, size, 0); |
|
if (ret < 0) |
|
return ret; |
|
ast->dshow_block_align = st->codec->block_align; |
|
if (ast->sample_size && st->codec->block_align && |
|
ast->sample_size != st->codec->block_align) { |
|
av_log(s, |
|
AV_LOG_WARNING, |
|
"sample size (%d) != block align (%d)\n", |
|
ast->sample_size, |
|
st->codec->block_align); |
|
ast->sample_size = st->codec->block_align; |
|
} |
|
/* 2-aligned |
|
* (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
|
if (size & 1) |
|
avio_skip(pb, 1); |
|
/* Force parsing as several audio frames can be in |
|
* one packet and timestamps refer to packet start. */ |
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; |
|
/* ADTS header is in extradata, AAC without header must be |
|
* stored as exact frames. Parser not needed and it will |
|
* fail. */ |
|
if (st->codec->codec_id == AV_CODEC_ID_AAC && |
|
st->codec->extradata_size) |
|
st->need_parsing = AVSTREAM_PARSE_NONE; |
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM |
|
* audio in the header but have Axan as stream_code_tag. */ |
|
if (ast->handler == AV_RL32("Axan")) { |
|
st->codec->codec_id = AV_CODEC_ID_XAN_DPCM; |
|
st->codec->codec_tag = 0; |
|
ast->dshow_block_align = 0; |
|
} |
|
if (amv_file_format) { |
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV; |
|
ast->dshow_block_align = 0; |
|
} |
|
if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) { |
|
av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align); |
|
ast->dshow_block_align = 0; |
|
} |
|
if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 || |
|
st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 || |
|
st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) { |
|
av_log(s, AV_LOG_DEBUG, "overriding sample_size\n"); |
|
ast->sample_size = 0; |
|
} |
|
break; |
|
case AVMEDIA_TYPE_SUBTITLE: |
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
|
st->request_probe= 1; |
|
avio_skip(pb, size); |
|
break; |
|
default: |
|
st->codec->codec_type = AVMEDIA_TYPE_DATA; |
|
st->codec->codec_id = AV_CODEC_ID_NONE; |
|
st->codec->codec_tag = 0; |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
} |
|
break; |
|
case MKTAG('s', 't', 'r', 'd'): |
|
if (stream_index >= (unsigned)s->nb_streams |
|
|| s->streams[stream_index]->codec->extradata_size |
|
|| s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) { |
|
avio_skip(pb, size); |
|
} else { |
|
uint64_t cur_pos = avio_tell(pb); |
|
if (cur_pos < list_end) |
|
size = FFMIN(size, list_end - cur_pos); |
|
st = s->streams[stream_index]; |
|
|
|
if (size<(1<<30)) { |
|
if (ff_get_extradata(st->codec, pb, size) < 0) |
|
return AVERROR(ENOMEM); |
|
} |
|
|
|
if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly |
|
avio_r8(pb); |
|
|
|
ret = avi_extract_stream_metadata(st); |
|
if (ret < 0) { |
|
av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n"); |
|
} |
|
} |
|
break; |
|
case MKTAG('i', 'n', 'd', 'x'): |
|
i = avio_tell(pb); |
|
if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && |
|
avi->use_odml && |
|
read_braindead_odml_indx(s, 0) < 0 && |
|
(s->error_recognition & AV_EF_EXPLODE)) |
|
goto fail; |
|
avio_seek(pb, i + size, SEEK_SET); |
|
break; |
|
case MKTAG('v', 'p', 'r', 'p'): |
|
if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) { |
|
AVRational active, active_aspect; |
|
|
|
st = s->streams[stream_index]; |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
avio_rl32(pb); |
|
|
|
active_aspect.den = avio_rl16(pb); |
|
active_aspect.num = avio_rl16(pb); |
|
active.num = avio_rl32(pb); |
|
active.den = avio_rl32(pb); |
|
avio_rl32(pb); // nbFieldsPerFrame |
|
|
|
if (active_aspect.num && active_aspect.den && |
|
active.num && active.den) { |
|
st->sample_aspect_ratio = av_div_q(active_aspect, active); |
|
av_dlog(s, "vprp %d/%d %d/%d\n", |
|
active_aspect.num, active_aspect.den, |
|
active.num, active.den); |
|
} |
|
size -= 9 * 4; |
|
} |
|
avio_skip(pb, size); |
|
break; |
|
case MKTAG('s', 't', 'r', 'n'): |
|
if (s->nb_streams) { |
|
ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
} |
|
default: |
|
if (size > 1000000) { |
|
av_log(s, AV_LOG_ERROR, |
|
"Something went wrong during header parsing, " |
|
"I will ignore it and try to continue anyway.\n"); |
|
if (s->error_recognition & AV_EF_EXPLODE) |
|
goto fail; |
|
avi->movi_list = avio_tell(pb) - 4; |
|
avi->movi_end = avi->fsize; |
|
goto end_of_header; |
|
} |
|
/* skip tag */ |
|
size += (size & 1); |
|
avio_skip(pb, size); |
|
break; |
|
} |
|
} |
|
|
|
end_of_header: |
|
/* check stream number */ |
|
if (stream_index != s->nb_streams - 1) { |
|
|
|
fail: |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
if (!avi->index_loaded && pb->seekable) |
|
avi_load_index(s); |
|
calculate_bitrate(s); |
|
avi->index_loaded |= 1; |
|
|
|
if ((ret = guess_ni_flag(s)) < 0) |
|
return ret; |
|
|
|
avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS); |
|
|
|
dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0); |
|
if (dict_entry && !strcmp(dict_entry->value, "PotEncoder")) |
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO |
|
|| st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) |
|
st->need_parsing = AVSTREAM_PARSE_FULL; |
|
} |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
if (st->nb_index_entries) |
|
break; |
|
} |
|
// DV-in-AVI cannot be non-interleaved, if set this must be |
|
// a mis-detection. |
|
if (avi->dv_demux) |
|
avi->non_interleaved = 0; |
|
if (i == s->nb_streams && avi->non_interleaved) { |
|
av_log(s, AV_LOG_WARNING, |
|
"Non-interleaved AVI without index, switching to interleaved\n"); |
|
avi->non_interleaved = 0; |
|
} |
|
|
|
if (avi->non_interleaved) { |
|
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); |
|
clean_index(s); |
|
} |
|
|
|
ff_metadata_conv_ctx(s, NULL, avi_metadata_conv); |
|
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv); |
|
|
|
return 0; |
|
} |
|
|
|
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt) |
|
{ |
|
if (pkt->size >= 7 && |
|
pkt->size < INT_MAX - AVPROBE_PADDING_SIZE && |
|
!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) { |
|
uint8_t desc[256]; |
|
int score = AVPROBE_SCORE_EXTENSION, ret; |
|
AVIStream *ast = st->priv_data; |
|
AVInputFormat *sub_demuxer; |
|
AVRational time_base; |
|
int size; |
|
AVIOContext *pb = avio_alloc_context(pkt->data + 7, |
|
pkt->size - 7, |
|
0, NULL, NULL, NULL, NULL); |
|
AVProbeData pd; |
|
unsigned int desc_len = avio_rl32(pb); |
|
|
|
if (desc_len > pb->buf_end - pb->buf_ptr) |
|
goto error; |
|
|
|
ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc)); |
|
avio_skip(pb, desc_len - ret); |
|
if (*desc) |
|
av_dict_set(&st->metadata, "title", desc, 0); |
|
|
|
avio_rl16(pb); /* flags? */ |
|
avio_rl32(pb); /* data size */ |
|
|
|
size = pb->buf_end - pb->buf_ptr; |
|
pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE), |
|
.buf_size = size }; |
|
if (!pd.buf) |
|
goto error; |
|
memcpy(pd.buf, pb->buf_ptr, size); |
|
sub_demuxer = av_probe_input_format2(&pd, 1, &score); |
|
av_freep(&pd.buf); |
|
if (!sub_demuxer) |
|
goto error; |
|
|
|
if (!(ast->sub_ctx = avformat_alloc_context())) |
|
goto error; |
|
|
|
ast->sub_ctx->pb = pb; |
|
|
|
if (ff_copy_whitelists(ast->sub_ctx, s) < 0) |
|
goto error; |
|
|
|
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { |
|
ff_read_packet(ast->sub_ctx, &ast->sub_pkt); |
|
*st->codec = *ast->sub_ctx->streams[0]->codec; |
|
ast->sub_ctx->streams[0]->codec->extradata = NULL; |
|
time_base = ast->sub_ctx->streams[0]->time_base; |
|
avpriv_set_pts_info(st, 64, time_base.num, time_base.den); |
|
} |
|
ast->sub_buffer = pkt->data; |
|
memset(pkt, 0, sizeof(*pkt)); |
|
return 1; |
|
|
|
error: |
|
av_freep(&ast->sub_ctx); |
|
av_freep(&pb); |
|
} |
|
return 0; |
|
} |
|
|
|
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, |
|
AVPacket *pkt) |
|
{ |
|
AVIStream *ast, *next_ast = next_st->priv_data; |
|
int64_t ts, next_ts, ts_min = INT64_MAX; |
|
AVStream *st, *sub_st = NULL; |
|
int i; |
|
|
|
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base, |
|
AV_TIME_BASE_Q); |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
st = s->streams[i]; |
|
ast = st->priv_data; |
|
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) { |
|
ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q); |
|
if (ts <= next_ts && ts < ts_min) { |
|
ts_min = ts; |
|
sub_st = st; |
|
} |
|
} |
|
} |
|
|
|
if (sub_st) { |
|
ast = sub_st->priv_data; |
|
*pkt = ast->sub_pkt; |
|
pkt->stream_index = sub_st->index; |
|
|
|
if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0) |
|
ast->sub_pkt.data = NULL; |
|
} |
|
return sub_st; |
|
} |
|
|
|
static int get_stream_idx(const unsigned *d) |
|
{ |
|
if (d[0] >= '0' && d[0] <= '9' && |
|
d[1] >= '0' && d[1] <= '9') { |
|
return (d[0] - '0') * 10 + (d[1] - '0'); |
|
} else { |
|
return 100; // invalid stream ID |
|
} |
|
} |
|
|
|
/** |
|
* |
|
* @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet |
|
*/ |
|
static int avi_sync(AVFormatContext *s, int exit_early) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int n; |
|
unsigned int d[8]; |
|
unsigned int size; |
|
int64_t i, sync; |
|
|
|
start_sync: |
|
memset(d, -1, sizeof(d)); |
|
for (i = sync = avio_tell(pb); !avio_feof(pb); i++) { |
|
int j; |
|
|
|
for (j = 0; j < 7; j++) |
|
d[j] = d[j + 1]; |
|
d[7] = avio_r8(pb); |
|
|
|
size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24); |
|
|
|
n = get_stream_idx(d + 2); |
|
av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n", |
|
d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); |
|
if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127) |
|
continue; |
|
|
|
// parse ix## |
|
if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) || |
|
// parse JUNK |
|
(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') || |
|
(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) { |
|
avio_skip(pb, size); |
|
goto start_sync; |
|
} |
|
|
|
// parse stray LIST |
|
if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') { |
|
avio_skip(pb, 4); |
|
goto start_sync; |
|
} |
|
|
|
n = get_stream_idx(d); |
|
|
|
if (!((i - avi->last_pkt_pos) & 1) && |
|
get_stream_idx(d + 1) < s->nb_streams) |
|
continue; |
|
|
|
// detect ##ix chunk and skip |
|
if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) { |
|
avio_skip(pb, size); |
|
goto start_sync; |
|
} |
|
|
|
if (avi->dv_demux && n != 0) |
|
continue; |
|
|
|
// parse ##dc/##wb |
|
if (n < s->nb_streams) { |
|
AVStream *st; |
|
AVIStream *ast; |
|
st = s->streams[n]; |
|
ast = st->priv_data; |
|
|
|
if (!ast) { |
|
av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n); |
|
continue; |
|
} |
|
|
|
if (s->nb_streams >= 2) { |
|
AVStream *st1 = s->streams[1]; |
|
AVIStream *ast1 = st1->priv_data; |
|
// workaround for broken small-file-bug402.avi |
|
if ( d[2] == 'w' && d[3] == 'b' |
|
&& n == 0 |
|
&& st ->codec->codec_type == AVMEDIA_TYPE_VIDEO |
|
&& st1->codec->codec_type == AVMEDIA_TYPE_AUDIO |
|
&& ast->prefix == 'd'*256+'c' |
|
&& (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) |
|
) { |
|
n = 1; |
|
st = st1; |
|
ast = ast1; |
|
av_log(s, AV_LOG_WARNING, |
|
"Invalid stream + prefix combination, assuming audio.\n"); |
|
} |
|
} |
|
|
|
if (!avi->dv_demux && |
|
((st->discard >= AVDISCARD_DEFAULT && size == 0) /* || |
|
// FIXME: needs a little reordering |
|
(st->discard >= AVDISCARD_NONKEY && |
|
!(pkt->flags & AV_PKT_FLAG_KEY)) */ |
|
|| st->discard >= AVDISCARD_ALL)) { |
|
if (!exit_early) { |
|
ast->frame_offset += get_duration(ast, size); |
|
avio_skip(pb, size); |
|
goto start_sync; |
|
} |
|
} |
|
|
|
if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) { |
|
int k = avio_r8(pb); |
|
int last = (k + avio_r8(pb) - 1) & 0xFF; |
|
|
|
avio_rl16(pb); // flags |
|
|
|
// b + (g << 8) + (r << 16); |
|
for (; k <= last; k++) |
|
ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8; |
|
|
|
ast->has_pal = 1; |
|
goto start_sync; |
|
} else if (((ast->prefix_count < 5 || sync + 9 > i) && |
|
d[2] < 128 && d[3] < 128) || |
|
d[2] * 256 + d[3] == ast->prefix /* || |
|
(d[2] == 'd' && d[3] == 'c') || |
|
(d[2] == 'w' && d[3] == 'b') */) { |
|
if (exit_early) |
|
return 0; |
|
if (d[2] * 256 + d[3] == ast->prefix) |
|
ast->prefix_count++; |
|
else { |
|
ast->prefix = d[2] * 256 + d[3]; |
|
ast->prefix_count = 0; |
|
} |
|
|
|
avi->stream_index = n; |
|
ast->packet_size = size + 8; |
|
ast->remaining = size; |
|
|
|
if (size) { |
|
uint64_t pos = avio_tell(pb) - 8; |
|
if (!st->index_entries || !st->nb_index_entries || |
|
st->index_entries[st->nb_index_entries - 1].pos < pos) { |
|
av_add_index_entry(st, pos, ast->frame_offset, size, |
|
0, AVINDEX_KEYFRAME); |
|
} |
|
} |
|
return 0; |
|
} |
|
} |
|
} |
|
|
|
if (pb->error) |
|
return pb->error; |
|
return AVERROR_EOF; |
|
} |
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int err; |
|
#if FF_API_DESTRUCT_PACKET |
|
void *dstr; |
|
#endif |
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
|
int size = avpriv_dv_get_packet(avi->dv_demux, pkt); |
|
if (size >= 0) |
|
return size; |
|
else |
|
goto resync; |
|
} |
|
|
|
if (avi->non_interleaved) { |
|
int best_stream_index = 0; |
|
AVStream *best_st = NULL; |
|
AVIStream *best_ast; |
|
int64_t best_ts = INT64_MAX; |
|
int i; |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
AVIStream *ast = st->priv_data; |
|
int64_t ts = ast->frame_offset; |
|
int64_t last_ts; |
|
|
|
if (!st->nb_index_entries) |
|
continue; |
|
|
|
last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; |
|
if (!ast->remaining && ts > last_ts) |
|
continue; |
|
|
|
ts = av_rescale_q(ts, st->time_base, |
|
(AVRational) { FFMAX(1, ast->sample_size), |
|
AV_TIME_BASE }); |
|
|
|
av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts, |
|
st->time_base.num, st->time_base.den, ast->frame_offset); |
|
if (ts < best_ts) { |
|
best_ts = ts; |
|
best_st = st; |
|
best_stream_index = i; |
|
} |
|
} |
|
if (!best_st) |
|
return AVERROR_EOF; |
|
|
|
best_ast = best_st->priv_data; |
|
best_ts = best_ast->frame_offset; |
|
if (best_ast->remaining) { |
|
i = av_index_search_timestamp(best_st, |
|
best_ts, |
|
AVSEEK_FLAG_ANY | |
|
AVSEEK_FLAG_BACKWARD); |
|
} else { |
|
i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); |
|
if (i >= 0) |
|
best_ast->frame_offset = best_st->index_entries[i].timestamp; |
|
} |
|
|
|
if (i >= 0) { |
|
int64_t pos = best_st->index_entries[i].pos; |
|
pos += best_ast->packet_size - best_ast->remaining; |
|
if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0) |
|
return AVERROR_EOF; |
|
|
|
av_assert0(best_ast->remaining <= best_ast->packet_size); |
|
|
|
avi->stream_index = best_stream_index; |
|
if (!best_ast->remaining) |
|
best_ast->packet_size = |
|
best_ast->remaining = best_st->index_entries[i].size; |
|
} |
|
else |
|
return AVERROR_EOF; |
|
} |
|
|
|
resync: |
|
if (avi->stream_index >= 0) { |
|
AVStream *st = s->streams[avi->stream_index]; |
|
AVIStream *ast = st->priv_data; |
|
int size, err; |
|
|
|
if (get_subtitle_pkt(s, st, pkt)) |
|
return 0; |
|
|
|
// minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM |
|
if (ast->sample_size <= 1) |
|
size = INT_MAX; |
|
else if (ast->sample_size < 32) |
|
// arbitrary multiplier to avoid tiny packets for raw PCM data |
|
size = 1024 * ast->sample_size; |
|
else |
|
size = ast->sample_size; |
|
|
|
if (size > ast->remaining) |
|
size = ast->remaining; |
|
avi->last_pkt_pos = avio_tell(pb); |
|
err = av_get_packet(pb, pkt, size); |
|
if (err < 0) |
|
return err; |
|
size = err; |
|
|
|
if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) { |
|
uint8_t *pal; |
|
pal = av_packet_new_side_data(pkt, |
|
AV_PKT_DATA_PALETTE, |
|
AVPALETTE_SIZE); |
|
if (!pal) { |
|
av_log(s, AV_LOG_ERROR, |
|
"Failed to allocate data for palette\n"); |
|
} else { |
|
memcpy(pal, ast->pal, AVPALETTE_SIZE); |
|
ast->has_pal = 0; |
|
} |
|
} |
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
|
AVBufferRef *avbuf = pkt->buf; |
|
#if FF_API_DESTRUCT_PACKET |
|
FF_DISABLE_DEPRECATION_WARNINGS |
|
dstr = pkt->destruct; |
|
FF_ENABLE_DEPRECATION_WARNINGS |
|
#endif |
|
size = avpriv_dv_produce_packet(avi->dv_demux, pkt, |
|
pkt->data, pkt->size, pkt->pos); |
|
#if FF_API_DESTRUCT_PACKET |
|
FF_DISABLE_DEPRECATION_WARNINGS |
|
pkt->destruct = dstr; |
|
FF_ENABLE_DEPRECATION_WARNINGS |
|
#endif |
|
pkt->buf = avbuf; |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
if (size < 0) |
|
av_free_packet(pkt); |
|
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE && |
|
!st->codec->codec_tag && read_gab2_sub(s, st, pkt)) { |
|
ast->frame_offset++; |
|
avi->stream_index = -1; |
|
ast->remaining = 0; |
|
goto resync; |
|
} else { |
|
/* XXX: How to handle B-frames in AVI? */ |
|
pkt->dts = ast->frame_offset; |
|
// pkt->dts += ast->start; |
|
if (ast->sample_size) |
|
pkt->dts /= ast->sample_size; |
|
av_dlog(s, |
|
"dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d " |
|
"base:%d st:%d size:%d\n", |
|
pkt->dts, |
|
ast->frame_offset, |
|
ast->scale, |
|
ast->rate, |
|
ast->sample_size, |
|
AV_TIME_BASE, |
|
avi->stream_index, |
|
size); |
|
pkt->stream_index = avi->stream_index; |
|
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) { |
|
AVIndexEntry *e; |
|
int index; |
|
|
|
index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY); |
|
e = &st->index_entries[index]; |
|
|
|
if (index >= 0 && e->timestamp == ast->frame_offset) { |
|
if (index == st->nb_index_entries-1) { |
|
int key=1; |
|
int i; |
|
uint32_t state=-1; |
|
for (i=0; i<FFMIN(size,256); i++) { |
|
if (st->codec->codec_id == AV_CODEC_ID_MPEG4) { |
|
if (state == 0x1B6) { |
|
key= !(pkt->data[i]&0xC0); |
|
break; |
|
} |
|
}else |
|
break; |
|
state= (state<<8) + pkt->data[i]; |
|
} |
|
if (!key) |
|
e->flags &= ~AVINDEX_KEYFRAME; |
|
} |
|
if (e->flags & AVINDEX_KEYFRAME) |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
} |
|
} else { |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
} |
|
ast->frame_offset += get_duration(ast, pkt->size); |
|
} |
|
ast->remaining -= err; |
|
if (!ast->remaining) { |
|
avi->stream_index = -1; |
|
ast->packet_size = 0; |
|
} |
|
|
|
if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) { |
|
av_free_packet(pkt); |
|
goto resync; |
|
} |
|
ast->seek_pos= 0; |
|
|
|
if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) { |
|
int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q); |
|
|
|
if (avi->dts_max - dts > 2*AV_TIME_BASE) { |
|
avi->non_interleaved= 1; |
|
av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n"); |
|
}else if (avi->dts_max < dts) |
|
avi->dts_max = dts; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
if ((err = avi_sync(s, 0)) < 0) |
|
return err; |
|
goto resync; |
|
} |
|
|
|
/* XXX: We make the implicit supposition that the positions are sorted |
|
* for each stream. */ |
|
static int avi_read_idx1(AVFormatContext *s, int size) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
int nb_index_entries, i; |
|
AVStream *st; |
|
AVIStream *ast; |
|
unsigned int index, tag, flags, pos, len, first_packet = 1; |
|
unsigned last_pos = -1; |
|
unsigned last_idx = -1; |
|
int64_t idx1_pos, first_packet_pos = 0, data_offset = 0; |
|
int anykey = 0; |
|
|
|
nb_index_entries = size / 16; |
|
if (nb_index_entries <= 0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
idx1_pos = avio_tell(pb); |
|
avio_seek(pb, avi->movi_list + 4, SEEK_SET); |
|
if (avi_sync(s, 1) == 0) |
|
first_packet_pos = avio_tell(pb) - 8; |
|
avi->stream_index = -1; |
|
avio_seek(pb, idx1_pos, SEEK_SET); |
|
|
|
if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) { |
|
first_packet_pos = 0; |
|
data_offset = avi->movi_list; |
|
} |
|
|
|
/* Read the entries and sort them in each stream component. */ |
|
for (i = 0; i < nb_index_entries; i++) { |
|
if (avio_feof(pb)) |
|
return -1; |
|
|
|
tag = avio_rl32(pb); |
|
flags = avio_rl32(pb); |
|
pos = avio_rl32(pb); |
|
len = avio_rl32(pb); |
|
av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", |
|
i, tag, flags, pos, len); |
|
|
|
index = ((tag & 0xff) - '0') * 10; |
|
index += (tag >> 8 & 0xff) - '0'; |
|
if (index >= s->nb_streams) |
|
continue; |
|
st = s->streams[index]; |
|
ast = st->priv_data; |
|
|
|
if (first_packet && first_packet_pos) { |
|
data_offset = first_packet_pos - pos; |
|
first_packet = 0; |
|
} |
|
pos += data_offset; |
|
|
|
av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len); |
|
|
|
// even if we have only a single stream, we should |
|
// switch to non-interleaved to get correct timestamps |
|
if (last_pos == pos) |
|
avi->non_interleaved = 1; |
|
if (last_idx != pos && len) { |
|
av_add_index_entry(st, pos, ast->cum_len, len, 0, |
|
(flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); |
|
last_idx= pos; |
|
} |
|
ast->cum_len += get_duration(ast, len); |
|
last_pos = pos; |
|
anykey |= flags&AVIIF_INDEX; |
|
} |
|
if (!anykey) { |
|
for (index = 0; index < s->nb_streams; index++) { |
|
st = s->streams[index]; |
|
if (st->nb_index_entries) |
|
st->index_entries[0].flags |= AVINDEX_KEYFRAME; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
/* Scan the index and consider any file with streams more than |
|
* 2 seconds or 64MB apart non-interleaved. */ |
|
static int check_stream_max_drift(AVFormatContext *s) |
|
{ |
|
int64_t min_pos, pos; |
|
int i; |
|
int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx)); |
|
if (!idx) |
|
return AVERROR(ENOMEM); |
|
for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) { |
|
int64_t max_dts = INT64_MIN / 2; |
|
int64_t min_dts = INT64_MAX / 2; |
|
int64_t max_buffer = 0; |
|
|
|
min_pos = INT64_MAX; |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
AVIStream *ast = st->priv_data; |
|
int n = st->nb_index_entries; |
|
while (idx[i] < n && st->index_entries[idx[i]].pos < pos) |
|
idx[i]++; |
|
if (idx[i] < n) { |
|
int64_t dts; |
|
dts = av_rescale_q(st->index_entries[idx[i]].timestamp / |
|
FFMAX(ast->sample_size, 1), |
|
st->time_base, AV_TIME_BASE_Q); |
|
min_dts = FFMIN(min_dts, dts); |
|
min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos); |
|
} |
|
} |
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
AVIStream *ast = st->priv_data; |
|
|
|
if (idx[i] && min_dts != INT64_MAX / 2) { |
|
int64_t dts; |
|
dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp / |
|
FFMAX(ast->sample_size, 1), |
|
st->time_base, AV_TIME_BASE_Q); |
|
max_dts = FFMAX(max_dts, dts); |
|
max_buffer = FFMAX(max_buffer, |
|
av_rescale(dts - min_dts, |
|
st->codec->bit_rate, |
|
AV_TIME_BASE)); |
|
} |
|
} |
|
if (max_dts - min_dts > 2 * AV_TIME_BASE || |
|
max_buffer > 1024 * 1024 * 8 * 8) { |
|
av_free(idx); |
|
return 1; |
|
} |
|
} |
|
av_free(idx); |
|
return 0; |
|
} |
|
|
|
static int guess_ni_flag(AVFormatContext *s) |
|
{ |
|
int i; |
|
int64_t last_start = 0; |
|
int64_t first_end = INT64_MAX; |
|
int64_t oldpos = avio_tell(s->pb); |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
int n = st->nb_index_entries; |
|
unsigned int size; |
|
|
|
if (n <= 0) |
|
continue; |
|
|
|
if (n >= 2) { |
|
int64_t pos = st->index_entries[0].pos; |
|
avio_seek(s->pb, pos + 4, SEEK_SET); |
|
size = avio_rl32(s->pb); |
|
if (pos + size > st->index_entries[1].pos) |
|
last_start = INT64_MAX; |
|
} |
|
|
|
if (st->index_entries[0].pos > last_start) |
|
last_start = st->index_entries[0].pos; |
|
if (st->index_entries[n - 1].pos < first_end) |
|
first_end = st->index_entries[n - 1].pos; |
|
} |
|
avio_seek(s->pb, oldpos, SEEK_SET); |
|
|
|
if (last_start > first_end) |
|
return 1; |
|
|
|
return check_stream_max_drift(s); |
|
} |
|
|
|
static int avi_load_index(AVFormatContext *s) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVIOContext *pb = s->pb; |
|
uint32_t tag, size; |
|
int64_t pos = avio_tell(pb); |
|
int64_t next; |
|
int ret = -1; |
|
|
|
if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0) |
|
goto the_end; // maybe truncated file |
|
av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end); |
|
for (;;) { |
|
tag = avio_rl32(pb); |
|
size = avio_rl32(pb); |
|
if (avio_feof(pb)) |
|
break; |
|
next = avio_tell(pb) + size + (size & 1); |
|
|
|
av_dlog(s, "tag=%c%c%c%c size=0x%x\n", |
|
tag & 0xff, |
|
(tag >> 8) & 0xff, |
|
(tag >> 16) & 0xff, |
|
(tag >> 24) & 0xff, |
|
size); |
|
|
|
if (tag == MKTAG('i', 'd', 'x', '1') && |
|
avi_read_idx1(s, size) >= 0) { |
|
avi->index_loaded=2; |
|
ret = 0; |
|
}else if (tag == MKTAG('L', 'I', 'S', 'T')) { |
|
uint32_t tag1 = avio_rl32(pb); |
|
|
|
if (tag1 == MKTAG('I', 'N', 'F', 'O')) |
|
ff_read_riff_info(s, size - 4); |
|
}else if (!ret) |
|
break; |
|
|
|
if (avio_seek(pb, next, SEEK_SET) < 0) |
|
break; // something is wrong here |
|
} |
|
|
|
the_end: |
|
avio_seek(pb, pos, SEEK_SET); |
|
return ret; |
|
} |
|
|
|
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp) |
|
{ |
|
AVIStream *ast2 = st2->priv_data; |
|
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base); |
|
av_free_packet(&ast2->sub_pkt); |
|
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 || |
|
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0) |
|
ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt); |
|
} |
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index, |
|
int64_t timestamp, int flags) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
AVStream *st; |
|
int i, index; |
|
int64_t pos, pos_min; |
|
AVIStream *ast; |
|
|
|
/* Does not matter which stream is requested dv in avi has the |
|
* stream information in the first video stream. |
|
*/ |
|
if (avi->dv_demux) |
|
stream_index = 0; |
|
|
|
if (!avi->index_loaded) { |
|
/* we only load the index on demand */ |
|
avi_load_index(s); |
|
avi->index_loaded |= 1; |
|
} |
|
av_assert0(stream_index >= 0); |
|
|
|
st = s->streams[stream_index]; |
|
ast = st->priv_data; |
|
index = av_index_search_timestamp(st, |
|
timestamp * FFMAX(ast->sample_size, 1), |
|
flags); |
|
if (index < 0) { |
|
if (st->nb_index_entries > 0) |
|
av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n", |
|
timestamp * FFMAX(ast->sample_size, 1), |
|
st->index_entries[0].timestamp, |
|
st->index_entries[st->nb_index_entries - 1].timestamp); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
/* find the position */ |
|
pos = st->index_entries[index].pos; |
|
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); |
|
|
|
av_dlog(s, "XX %"PRId64" %d %"PRId64"\n", |
|
timestamp, index, st->index_entries[index].timestamp); |
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
|
/* One and only one real stream for DV in AVI, and it has video */ |
|
/* offsets. Calling with other stream indexes should have failed */ |
|
/* the av_index_search_timestamp call above. */ |
|
|
|
if (avio_seek(s->pb, pos, SEEK_SET) < 0) |
|
return -1; |
|
|
|
/* Feed the DV video stream version of the timestamp to the */ |
|
/* DV demux so it can synthesize correct timestamps. */ |
|
ff_dv_offset_reset(avi->dv_demux, timestamp); |
|
|
|
avi->stream_index = -1; |
|
return 0; |
|
} |
|
|
|
pos_min = pos; |
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st2 = s->streams[i]; |
|
AVIStream *ast2 = st2->priv_data; |
|
|
|
ast2->packet_size = |
|
ast2->remaining = 0; |
|
|
|
if (ast2->sub_ctx) { |
|
seek_subtitle(st, st2, timestamp); |
|
continue; |
|
} |
|
|
|
if (st2->nb_index_entries <= 0) |
|
continue; |
|
|
|
// av_assert1(st2->codec->block_align); |
|
av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001); |
|
index = av_index_search_timestamp(st2, |
|
av_rescale_q(timestamp, |
|
st->time_base, |
|
st2->time_base) * |
|
FFMAX(ast2->sample_size, 1), |
|
flags | |
|
AVSEEK_FLAG_BACKWARD | |
|
(st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); |
|
if (index < 0) |
|
index = 0; |
|
ast2->seek_pos = st2->index_entries[index].pos; |
|
pos_min = FFMIN(pos_min,ast2->seek_pos); |
|
} |
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st2 = s->streams[i]; |
|
AVIStream *ast2 = st2->priv_data; |
|
|
|
if (ast2->sub_ctx || st2->nb_index_entries <= 0) |
|
continue; |
|
|
|
index = av_index_search_timestamp( |
|
st2, |
|
av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), |
|
flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); |
|
if (index < 0) |
|
index = 0; |
|
while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min) |
|
index--; |
|
ast2->frame_offset = st2->index_entries[index].timestamp; |
|
} |
|
|
|
/* do the seek */ |
|
if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) { |
|
av_log(s, AV_LOG_ERROR, "Seek failed\n"); |
|
return -1; |
|
} |
|
avi->stream_index = -1; |
|
avi->dts_max = INT_MIN; |
|
return 0; |
|
} |
|
|
|
static int avi_read_close(AVFormatContext *s) |
|
{ |
|
int i; |
|
AVIContext *avi = s->priv_data; |
|
|
|
for (i = 0; i < s->nb_streams; i++) { |
|
AVStream *st = s->streams[i]; |
|
AVIStream *ast = st->priv_data; |
|
if (ast) { |
|
if (ast->sub_ctx) { |
|
av_freep(&ast->sub_ctx->pb); |
|
avformat_close_input(&ast->sub_ctx); |
|
} |
|
av_freep(&ast->sub_buffer); |
|
av_free_packet(&ast->sub_pkt); |
|
} |
|
} |
|
|
|
av_freep(&avi->dv_demux); |
|
|
|
return 0; |
|
} |
|
|
|
static int avi_probe(AVProbeData *p) |
|
{ |
|
int i; |
|
|
|
/* check file header */ |
|
for (i = 0; avi_headers[i][0]; i++) |
|
if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) && |
|
AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4)) |
|
return AVPROBE_SCORE_MAX; |
|
|
|
return 0; |
|
} |
|
|
|
AVInputFormat ff_avi_demuxer = { |
|
.name = "avi", |
|
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"), |
|
.priv_data_size = sizeof(AVIContext), |
|
.extensions = "avi", |
|
.read_probe = avi_probe, |
|
.read_header = avi_read_header, |
|
.read_packet = avi_read_packet, |
|
.read_close = avi_read_close, |
|
.read_seek = avi_read_seek, |
|
.priv_class = &demuxer_class, |
|
};
|
|
|